Asymptotic behavior of solutions of nonautonomous $n$th order ordinary differential equations. Neliniini Kolyvannya, [S. l.], v. 19, n. 1, p. 22–31, 2016. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/808. Acesso em: 6 dec. 2025.